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WO2002045117A2 - Dispositif d'affichage d'image a consommation d'energie reduite pour la deflexion - Google Patents

Dispositif d'affichage d'image a consommation d'energie reduite pour la deflexion Download PDF

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Publication number
WO2002045117A2
WO2002045117A2 PCT/EP2001/013562 EP0113562W WO0245117A2 WO 2002045117 A2 WO2002045117 A2 WO 2002045117A2 EP 0113562 W EP0113562 W EP 0113562W WO 0245117 A2 WO0245117 A2 WO 0245117A2
Authority
WO
WIPO (PCT)
Prior art keywords
deflection
display device
display screen
picture display
electron beam
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2001/013562
Other languages
English (en)
Other versions
WO2002045117A3 (fr
Inventor
Marteijn De Jong
Marcellinus P. C. M. Krijn
Pim T. Tuyls
Boris Skoric
Michel C. J. . M. Vissenberg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Priority to EP01989499A priority Critical patent/EP1415319A2/fr
Priority to KR1020027009496A priority patent/KR20020070355A/ko
Priority to JP2002547189A priority patent/JP2004515046A/ja
Publication of WO2002045117A2 publication Critical patent/WO2002045117A2/fr
Anticipated expiration legal-status Critical
Publication of WO2002045117A3 publication Critical patent/WO2002045117A3/fr
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/70—Arrangements for deflecting ray or beam
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/70—Arrangements for deflecting ray or beam
    • H01J29/72—Arrangements for deflecting ray or beam along one straight line or along two perpendicular straight lines
    • H01J29/76—Deflecting by magnetic fields only
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/861—Vessels or containers characterised by the form or the structure thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/86—Vessels and containers
    • H01J2229/8603—Neck or cone portions of the CRT vessel
    • H01J2229/8606—Neck or cone portions of the CRT vessel characterised by the shape

Definitions

  • the invention relates to a picture display device comprising :
  • cathode ray tube having an elongated display screen with a long axis and a short axis, a cone portion whose cross-section has an elongated shape with a long axis and a short axis, a neck comprising means for generating at least one electron beam, and
  • a deflection system mounted on said cone portion for generating electromagnetic fields for deflecting said electron beam(s).
  • a picture display device as described above is known from US patent no. 5,962,964.
  • the CRT of said known display device comprises a cone portion whose cross- section varies gradually from a circular shape at the neck end of the cone portion to a rectangular shape at the display screen end of the cone portion.
  • the cone portion of said known display device has a cross-section which has a substantially rectangular shape.
  • the deflection system can therefore be positioned closer to the envelope of the electron beam(s) than within CRTs whose cones have circular cross-sections. Magnetic losses are thereby reduced and, as a result, less deflection power is needed.
  • the picture display device is therefore characterized in that the deflection system is arranged to scan the electron beam(s) along lines substantially parallel to the short axis of the display screen, and in that the part of the cone portion which is under the deflection system has at least one cross-section whose internal outline has a long axis/short axis ratio (A c ) which is larger than or equal to the long axis/short axis ratio (A scr ) of the display screen.
  • a c long axis/short axis ratio
  • the present invention allows a further reduction of deflection power of about 30% as compared with the cited prior art. This reduction is essentially achieved by reducing the line deflection power, which is the major consumer in the deflection system.
  • the line deflection power is reduced by reducing the sweep amplitude, which is achieved by scanning the lines substantially parallel to the short axis of the display screen (called transposed scan)instead of parallel to the long axis of the display screen (called normal scan) and the line deflection power is further reduced by reducing magnetic losses, which is achieved by bringing the line deflection system closer to the electron beam envelope, while paying particular attention to the aspect ratio of the latter.
  • the picture display device in accordance with the invention comprises a cone portion whose cross-section in parts of the region under the deflection system has an aspect ratio (A c ) which is also larger than or equal to A scr .
  • a e ⁇ exceeds A scr in parts of the region under the deflection system to the extent that (A e ⁇ -1 )/(A scr -1 ) > 1.1 , and therefore it is advantageous that A c also exceeds A scr to the extent that (A c -l)/(A SC r — 1) ⁇ 1.1 in parts of that region.
  • the cross-section of the cone has a shape which follows the shape of the electron beam envelope as closely as possible. Therefore, it is advantageous that, in this region, A c first increases, goes through a maximum and then decreases.
  • the invention is thus particularly effective for picture display devices with large screen aspect ratios.
  • the invention is advantageous for picture display devices with and a fortiori for picture display devices with A scr >16/9.
  • deflection power may be used advantageously to increase the maximum deflection angle of the electron beam(s).
  • maximum deflection angles larger than or equal to 120° are realised. This is useful in building slimmer CRTs.
  • FIG.l is a sectional view of a picture display device according to an embodiment of the invention
  • FIG.2 is a sectional view of the display window
  • FIGS.3 a and 3b are schematic representations of a cross-section of a picture display device under the deflection system according to the prior art and according to an embodiment of the present invention, respectively, showing the principle of normal scanning versus transposed scanning;
  • FIG.4a is a cross-section of the electron beam envelope in the region under the deflection system;
  • FIG.4b is a graph showing the values of the aspect ratio of the electron beam envelope along the z-axis for a CRT with normal scanning and with transposed scanning;
  • FIGS.5a and 5b are schematic representations of a cross-section of a picture display device under the deflection system, showing the difference in cone aspect ratios.
  • FIG.6 is a graph showing the values of the aspect ratio of the electron beam envelope along the z-axis for a CRT with transposed scanning for various screen aspect ratios and for various maximum deflection angles.
  • FIG.1 A picture display device according to a preferred embodiment of the invention is shown in FIG.1.
  • a cathode ray tube (1) which includes a display window (2), a cone portion (3), and a neck (4).
  • the neck (4) accommodates a means (5) for generating at least one electron beam (6).
  • three electron beams are generated in one plane (the in-line plane).
  • the inner surface of the display window (2) comprises a large number of phosphor elements which form a display screen (8).
  • the electron beam (6) hits a phosphor element, the latter becomes phosphorescent, thereby creating a visible spot on the display screen (8).
  • the electron beam (6) substantially coincides with the tube axis (7).
  • the electron beam (6) is deflected by means of a deflection system (9) covering a part (3a) of the cone portion (3).
  • Said deflection system (9) comprises a line deflection subsystem (12) and a frame deflection subsystem (13), in order to create a two-dimensional picture on the display screen (8).
  • the deflection system (9) is made up of sets of coils, one set for the line deflection subsystem (12) and another set for the frame deflection subsystem (13).
  • FIG.1 also shows the reference deflection plane (11) which is a plane perpendicular to the tube axis (7) and going through the point of intersection between the tube axis (7) and the asymptote to the trajectory (10) of the electron beam when deflected to a corner of the display screen (8).
  • the reference deflection plane (11) is a plane perpendicular to the tube axis (7) and going through the point of intersection between the tube axis (7) and the asymptote to the trajectory (10) of the electron beam when deflected to a corner of the display screen (8).
  • the display screen (8) has an elongated shape with two perpendicular axes of symmetry : a long axis (21) having a length of L scr and a short axis (22) having a length of S scr .
  • the maximum deflection angle is also defined as the angle ⁇ between the tube axis (7) and the deflected electron beam (10) when the electron beam is deflected so as to hit a point on the display screen (8) which is furthest away from the intersection between the tube axis (7) and the display screen (8).
  • FIGS. 3a and 3b schematically show a cross-section of a picture display device in a region (3a) where the cone portion (3) is under the deflection system (9) according to the prior art (FIG.3a) and according to an embodiment of the present invention (FIG.3b), respectively.
  • a cross-section (32a,b) of the cone portion under the deflection system (9) has an elongated shape with two perpendicular axes of symmetry : a long axis (21a,b) having a length of L c and a short axis (22a,b) having a length of S c .
  • the line deflection subsystem (12a) deflects the electron beam (6) so as to scan the display screen (8) along lines substantially parallel to the long axis (21a) of the display screen (called normal scan).
  • the line deflection subsystem (12b) deflects the electron beam so as to scan the display screen (8) along lines substantially parallel to the short axis (22b) of the display screen (called transposed scan), and a cross- section (32b) of the cone portion under the deflection system (9) has an aspect ratio A c which is larger than the aspect ratio of the display screen (A scr ).
  • the line deflection power can be reduced by virtue of the reduced sweep amplitude.
  • the inventors have also realized that, with transposed scan, the electron beam envelope in part of the region under the deflection system (9) has a particular shape.
  • a cross-section (40) of the electron beam envelope in said region has an elongated shape with a long axis (41) having a length of L e ⁇ and a short axis (42) having a length of S e ⁇ .
  • a picture display device comprises a cone portion in part of the region under the deflection system (9) whose cross-section has an aspect ratio (A c ) which is also larger than or equal to A s r - This allows bringing the deflection system (9), and in particular the line deflection subsystem (12), much closer to the electron beam envelope, thereby reducing magnetic losses and consequently reducing the deflection power.
  • FIG.5a and FIG.5b Both Figures schematically show a cross-section of a picture display device in part of the region (3 a) under the deflection system (9).
  • FIG.5a shows a cone cross-section (53) with an aspect ratio A c which is smaller than the aspect ratio A scr of the display screen (8)
  • FIG.5b shows a cone cross- section (54) with an aspect ratio A c which is larger than the aspect ratio A scr of the display screen (8), thereby enabling the line deflection subsystem (12) to be positioned closer to the electron beam envelope (51).
  • a e ⁇ exceeds A scr to the extent that (A e ⁇ -l)/(A scr -l) > 1.1 in part of the region under the deflection system (9), and therefore it is advantageous that A c also exceeds A scr to the extent that (A c -l)/(A SC r-l) > 1.1 in that region.
  • the power reduction effect increases with growing screen aspect ratios, so that the present invention is particularly attractive for new type picture display devices with large screen aspect ratios such as A scr >4/3, and a fortiori for A scr > 16/9.
  • a picture display device can reduce the deflection power by about 30% as compared with the prior art.
  • a further merit of the invention is that the reduction of deflection power can be used advantageously to increase the maximum deflection angle.
  • the depth of the CRT can be reduced in this way, leading to slimmer picture display devices.

Landscapes

  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Details Of Television Scanning (AREA)

Abstract

L'invention concerne un dispositif d'affichage d'image comprenant un tube cathodique (1) qui présente un écran d'affichage allongé (8) et un système de déflexion (9). Deux moyens permettent de réduire la consommation d'énergie pour la déflexion. Le système de déflexion (9) est agencé de manière à balayer les lignes dans le sens de l'axe court (22) de l'écran d'affichage (8), et la partie conique (3) du tube cathodique (1) présente une section transversale allongée (54) dont le facteur de forme est supérieur ou égal à celui de l'écran d'affichage (8), permettant ainsi au système de déflexion (9), et en particulier au sous-système de déflexion de ligne (12), d'être positionné plus près de l'enveloppe de faisceau électronique (51), ce qui réduit les pertes magnétiques.
PCT/EP2001/013562 2000-11-29 2001-11-20 Dispositif d'affichage d'image a consommation d'energie reduite pour la deflexion Ceased WO2002045117A2 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP01989499A EP1415319A2 (fr) 2000-11-29 2001-11-20 Dispositif d'affichage d'image a consommation d'energie reduite pour la deflexion
KR1020027009496A KR20020070355A (ko) 2000-11-29 2001-11-20 감소된 편향 전력을 갖는 화상 디스플레이 디바이스
JP2002547189A JP2004515046A (ja) 2000-11-29 2001-11-20 減少した偏向電力の映像ディスプレイデバイス

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP00204239 2000-11-29
EP00204239.8 2000-11-29

Publications (2)

Publication Number Publication Date
WO2002045117A2 true WO2002045117A2 (fr) 2002-06-06
WO2002045117A3 WO2002045117A3 (fr) 2004-02-19

Family

ID=8172347

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2001/013562 Ceased WO2002045117A2 (fr) 2000-11-29 2001-11-20 Dispositif d'affichage d'image a consommation d'energie reduite pour la deflexion

Country Status (6)

Country Link
US (1) US6720725B2 (fr)
EP (1) EP1415319A2 (fr)
JP (1) JP2004515046A (fr)
KR (1) KR20020070355A (fr)
TW (1) TW550526B (fr)
WO (1) WO2002045117A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK0968011T3 (da) * 1997-03-27 2004-12-20 Smith & Nephew Inc Fremgangsmåde til overfladeoxidation af zirkoniumlegeringer og fremstillet produkt
ITMI20060014A1 (it) * 2006-01-05 2007-07-06 Videocolor Spa Dispositivo di sospensione di tubo a raggi catodici

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4834349B1 (fr) * 1969-11-04 1973-10-20
NL8802998A (nl) * 1988-12-07 1990-07-02 Philips Nv Beeldweergeefinrichting met aftastrichtingsomzetting.
NL8900935A (nl) * 1989-04-14 1990-11-01 Philips Nv Beeldweergeefinrichting.
DE4109274A1 (de) * 1991-03-21 1992-09-24 Thomson Brandt Gmbh Farbbildroehre
JPH09306388A (ja) * 1996-05-14 1997-11-28 Toshiba Corp 陰極線管
JP3442975B2 (ja) * 1996-09-18 2003-09-02 株式会社東芝 陰極線管装置
JP3403005B2 (ja) * 1997-06-20 2003-05-06 株式会社東芝 陰極線管装置
JPH11329299A (ja) * 1998-03-17 1999-11-30 Toshiba Corp 陰極線管装置および偏向ヨ―ク
US6307313B1 (en) * 1998-03-31 2001-10-23 Kabushiki Kaisha Toshiba Cathode ray tube apparatus
JPH11345579A (ja) * 1998-03-31 1999-12-14 Toshiba Electronic Engineering Corp 陰極線管装置および偏向ヨ―ク
KR100309764B1 (ko) * 1998-11-10 2002-05-01 김순택 음극선관
US6465944B1 (en) * 2000-05-26 2002-10-15 Sarnoff Corporation Space-saving cathode ray tube employing a six-pole neck coil

Also Published As

Publication number Publication date
EP1415319A2 (fr) 2004-05-06
JP2004515046A (ja) 2004-05-20
TW550526B (en) 2003-09-01
US20020063508A1 (en) 2002-05-30
US6720725B2 (en) 2004-04-13
KR20020070355A (ko) 2002-09-05
WO2002045117A3 (fr) 2004-02-19

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